It would be super useful to be able to use wildcards as part of the item names -- in the whitelist/blacklist sections, for example. I'd love to be able to just say "actuallyadditions:item_misc:*" instead of having to manually specify each metadata value.

Will be added next version for blacklists. I cannot do this for whitelists as frequently mods use metadata values as intermediate steps or non-functional items.

Ah, that makes sense. Any way you could do something like actuallyadditions:item_misc:[1, 2, 3] et cetera? I know it's a bit of parsing work, but it would still cut down a ton on repetition in the config file. (If not, no big deal!)

I already have parsing for that.
The damage range can be a single integer, for a single damage value, or a collection of integers, &s, and #s. A # indicates a skip between two numbers, and an & indicates inclusion between two numbers. For example, 0&5#8&10 uses the damage values 0, 1, 2, 3, 4, 5, 8, 9, 10.

Excellent! One other related question, if you don't mind: I have a family server set up, and I've been tweaking the lootbags.cfg file so bag contents make a bit more sense with all the mods we have running. JEI only seems to update the lootbag contents if I update the config file on the client. If I only update the server copy, JEI doesn't reflect the changes. Is this expected behavior?

Hey, since you answered my other question, and my new one is unrelated, I’ll close this issue. No point in cluttering up stuff for you 😁